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License key generation help


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Hi, I have pre-written code that produces a license key but I don’t like the format that the key is in and was wondering if I could get some help fixing it?
This is the code

<script type="text/javascript">
    function Createkey(length) {
       var result           = '';
       var characters       = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
       var charactersLength = characters.length;
       for ( var i = 0; i < length; i++ ) {
          result += characters.charAt(Math.floor(Math.random() * charactersLength));
       return result;
        var GetType = $('#type_of_key_id').find(":selected").text();

the output is just a random string of 18 characters like: H3CJPE5JMS501FH52A

though I want to get an output like: FSOWP-DHJEO-SKJ3D-2DF5R-3FG51

What can I change in the code to get the second output option?

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14 hours ago, Phi11W said:

Something like this? 

for ( var i = 0 ; i < length ; ++i ) {
   if ( ( 0 = ( i % 5 ) ) && ( 0 != i ) ) 
      result .= '-' ; 
   result .= characters.charAt(Math.floor(Math.random() * charactersLength));

   Phill  W. 

I was hopeful for this but it doesn't give me an output now, like no key is even generated now

Edited by johnny233
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